President Bush’s nominee for attorney general told the Senate Judiciary Committee on Tuesday that he does not know whether waterboarding is illegal. He pledged to study the matter and to reverse any Justice Department finding that endorses a practice that violates the law or the Constitution.

“If, after such a review, I determine that any technique is unlawful, I will not hesitate to so advise the president and will rescind or correct any legal opinion of the Department of Justice that supports the use of the technique,” Michael Mukasey wrote to the committee’s 10 Democrats.